[issue1621] Do not assume signed integer overflow behavior

[Xiang Zhang]

Xiang Zhang added the comment:

So these checks are superfluous? Do we need to remove them?

Hmm, I still doubt such checks should consider platform characteristics first. In theory List can be PY_SSIZE_T_MAX length. Do we have to put the PY_SIZE_MAX // sizeof(PyObject *) limit on it?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1621>
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